I like those where did you gather the parts?
All the parts are from many different vendors.
The wire was from a local welding supply shop.
The crimp rings are from Waytekwire.com
The dual wall heatshrink is from Waytekwire.com
The boots are from Vtewarehouse.com
The polarity heatshrink bands are from Wrangler NW. The website used to be wranglernw.com but it does not seem to be an active website anymore.
I purchased the green cable cover from Ebay. It is an expandable fiberglass cable that is flame resistant. It is the same type of material they use to protect the wires in ovens. There are other covers I would use now.
I have a set of heavy duty crimpers that I used to crimp the ring terminals. They will crimp up to 4/0 rings. I now have a heavy duty hydraulic crimper that I use.
You could get most of the parts from Waytekwire.com. The only items that might be hard to source now would be the heatshrink polarity bands.
If you need any help figuring out exactly what you would need to make a set of cables, send me a PM.